Cold roll forming technique of large-sized curve type steel tube

Abstract

The invention discloses a processing technique for the cold-bending and shaping of a large curved steel pipe. The length of the axis of the large curved steel pipe is calculated at first; then the axis of the curved steel pipe is equally divided into sections; one end of the axis of the curved steel pipe is used as a coordinate dot for building a Descartes local coordinate system; the coordinates of the subsection points of the axis in the Descartes local coordinate system are calculated; steel pipe baiting is carried out according to the calculated length of the axis of the steel pipe; a curve which is homocentric with the axis of the steel pipe is marked on a pipe wall at the inner side of the curve of the bending plane of the curved steel pipe; besides, the positions of the subsection points are marked; the steel pipe marked with the positions of the subsection points are bent and shaped under a three-roller or four-roller bending machine, or is pressed and shaped under a large hydraulic press. The processing technique not only has high production efficiency and effectively solves the technical problems for the shaping and processing of the large curved steel pipe, but also can ensure the product quality and reduce the cost.

Description

technical field [0001] The invention relates to a metal component processing technology, which is mainly applied to the processing technology of curved components of building steel structures. Background technique [0002] With the improvement of architectural design level and the development of processing equipment, curved steel pipes are used more and more in architectural steel structures. Since the axis of curved steel pipes is an arbitrary space curve and the curvature changes randomly, the diameter of most components is particularly large. , the wall thickness is particularly thick, which is a non-standard component. If it is formed by hot rolling process, special mold making is required, and the existing smelting equipment must be modified. In this way, not only the cost is high, but also the cycle is long. For some special diameter Curved steel pipes with large and complex curved shapes even have technical or equipment problems that are difficult to overcome. Conte...

AI Technical Summary

Problems solved by technology

[0002] With the improvement of architectural design level and the development of processing equipment, curved steel pipes are used more and more in architectural steel structures. Since the axis of curved steel pipes is an arbitrary space curve and the curvature changes randomly, the diameter of most components is particularly large. , the wall thickness is particularly thick, which is a non-standard component. If it is formed by hot rolling process, special mold making is required, and the existing smelting equipment must be modified. In this way, not only the cost is high, but also the cycle is long. For some special diameter Curved steel pipes with large and complex curve shapes even have technical or equipment problems that are difficult to overcome